outputMode (DataStreamWriter)

Specifies how data of a streaming DataFrame is written to a streaming sink.

Syntax

outputMode(outputMode)

Parameters

Parameter	Type	Description
outputMode	str	Output mode. Options are append (only new rows), complete (all rows on every update), and update (only updated rows on every update; equivalent to append if the query contains no aggregations).

Parameter	Type	Description
outputMode	str	Output mode. Options are append (only new rows), complete (all rows on every update), and update (only updated rows on every update; equivalent to append if the query contains no aggregations).

Returns

DataStreamWriter

Examples

Python

df = spark.readStream.format("rate").load()
df.writeStream.outputMode('append')
# <...streaming.readwriter.DataStreamWriter object ...>

Use complete mode to print aggregated counts:

Python

import time
df = spark.readStream.format("rate").option("rowsPerSecond", 10).load()
df = df.groupby().count()
q = df.writeStream.outputMode("complete").format("console").start()
time.sleep(3)
q.stop()